<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/welcome' }" @click="clearSeeion">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品添加</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>

            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>

            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>

            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>

            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cataProp"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item v-for="item in manyTabDate" :key="item.attr_id" :label="item.attr_name">
              <!-- 复选框 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTabDate" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传的地址 -->
            <el-upload
              class="upload-demo"
              :action="actionURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="hearderObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>

          <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" alt class="imgStyle" />
          </el-dialog>

          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>

            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
  </div>
</template>

<script>
import _ from "lodash";

export default {
  data() {
    return {
      // 当前激活的面板
      activeIndex: "0",
      // 添加信息
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [],
        goods_introduce: "",
        attrs: []
      },
      // 表单验证规则列表
      addFormRules: {
        goods_name: [
          {
            required: true,
            message: "请输入商品名称",
            trigger: "blur"
          }
        ],
        goods_price: [
          {
            required: true,
            message: "请输入商品价格",
            trigger: "blur"
          }
        ],
        goods_weight: [
          {
            required: true,
            message: "请输入商品重量",
            trigger: "blur"
          }
        ],
        goods_number: [
          {
            required: true,
            message: "请输入商品数量",
            trigger: "blur"
          }
        ],
        goods_cat: [
          {
            required: true,
            message: "请选择商品分类",
            trigger: "blur"
          }
        ]
      },
      // 商品信息列表
      cateList: [],
      // 级联选择器规则列表
      cataProp: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      // 动态参数列表
      manyTabDate: [],
      // 静态参数列表
      onlyTabDate: [],
      // 图片要上传的地址
      actionURL: "http://127.0.0.1:8888/api/private/v1/upload",
      hearderObj: {
        Authorization: window.sessionStorage.getItem("token")
      },
      // 预览图片的地址
      previewPath: "",
      // 预览窗口的显示与隐藏
      previewVisible: false
    };
  },
  methods: {
    clearSeeion() {
      window.sessionStorage.setItem("activePath", "");
    },
    async getCateList() {
      const { data: res } = await this.$http.get("categories");

      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败！");
      }

      // 把数据列表，赋值给 catelist
      this.cateList = res.data;
    },
    // 级联选择器选中项发生变化时
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },
    //  切换面板前的检查函数
    beforeTabLeave(activeName, oldactiveName) {
      if (oldactiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请先选择商品分类！");
        return false;
      }
    },
    async tabClicked() {
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "many" } }
        );

        if (res.meta.status !== 200) {
          return this.$message.error("获取商品分类失败！");
        }
        res.data.forEach(ele => {
          ele.attr_vals =
            ele.attr_vals.length === 0 ? [] : ele.attr_vals.split(" ");
        });
        this.manyTabDate = res.data;
      } else if (this.activeIndex === "2") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "only" } }
        );

        if (res.meta.status !== 200) {
          return this.$message.error("获取商品分类失败！");
        }
        this.onlyTabDate = res.data;
      }
    },
    // 图片预览函数
    handlePreview(file) {
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    // 处理移除图片的操作
    handleRemove(file) {
      const filePath = file.response.data.tmp_path;
      const i = this.addForm.pics.findIndex(x => x.pic === filePath);
      this.addForm.pics.splice(i, 1);
    },
    // 图片上传成功时的返回函数
    handleSuccess(response) {
      const picInfo = { pic: response.data.tmp_path };
      this.addForm.pics.push(picInfo);
    },
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error("请填写必要的表单项！");
        }
        // 处理动态参数
        this.manyTabDate.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" ")
          };
          this.addForm.attrs.push(newInfo);
        });
        // 处理静态属性
        this.onlyTabDate.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          };
          this.addForm.attrs.push(newInfo);
        });
        const from = _.cloneDeep(this.addForm);
        from.goods_cat = from.goods_cat.join(",");

        // 发起请求添加数据
        const { data: res } = await this.$http.post("goods", from);
        if (res.meta.status !== 201) {
          return this.$message.error("添加商品失败！");
        }
        this.$message.success("添加商品成功！");
        this.$router.push("/goods");
      });
    }
  },
  created() {
    this.getCateList();
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    }
  }
};
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.imgStyle {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}
</style>